Abstract
Subcellular location, chlorate specificity, and sensitivity to micromolar concentrations of azide suggest that most of the anaerobically induced nitrate reductase (NR) activity in Bradyrhizobium sp. (Lupinus) could be ascribed to the membrane type of bacterial dissimilatory NRs. Two active complexes of the enzyme, NRI of 140 kDa and NRII of 190 kDa, were detected in membranes of the nitrate-respiring USDA strain 3045. Both enzyme forms were purified to homogeneity. Obtained specific antibodies showed that these native species were immunologically closely related and composed of largely similar 126-kDa, 65-kDa, and 25-kDa subunits. The finding that NRI and NRII share common epitopes suggests that they may not be different species, but rather two forms of the same enzyme.
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Acknowledgments
This work was supported by grants from the Polish State Committee for Scientific Research: 6 P04C 026 20 to R. L. and 2 P06R 077 27 to W. P. (years 2004–2007).
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Polcyn, W., Luciński, R. Dissimilatory Nitrate Reductase from Bradyrhizobium sp. (Lupinus): Subcellular Location, Catalytic Properties, and Characterization of the Active Enzyme Forms. Curr Microbiol 52, 231–237 (2006). https://doi.org/10.1007/s00284-005-0265-x
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DOI: https://doi.org/10.1007/s00284-005-0265-x